[Solved]Qt Mac: can not link ffmpeg library

I want to link ffmpeg library using Qt under Mac OS X, but fail.

My environment are:
Mac OS X 10.6.4
xCode 3.2.3
Qt_SDK_Mac64_offline_v1_1_3_en.dmg
ffmpeg-0.7.4.tar.bz2

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My step are:
1). run terminal
2). type “sudo -s”, to administrator privileges

these steps followed are to compile and install ffmpeg.
3). type “cd /Volumes/Mac_OS_5/tools/Components/ffmpeg/ffmpeg-0.7.4”
4). type “./configure —disable-yasm”
5). type “make”
6). type “make install”

after ffmpeg installed, there are directories and files under /usr/local as below:

and then I type “ffmpeg”, the message is:
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ffmpeg version 0.7.4, Copyright © 2000-2011 the FFmpeg developers built on Sep 22 2011 16:12:41 with gcc 4.2.1 (Apple Inc. build 5664) configuration: —disable-yasm libavutil 50. 43. 0 / 50. 43. 0 libavcodec 52.122. 0 / 52.122. 0 libavformat 52.110. 0 / 52.110. 0 libavdevice 52. 5. 0 / 52. 5. 0 libavfilter 1. 80. 0 / 1. 80. 0 libswscale 0. 14. 1 / 0. 14. 1
Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]… {[outfile options] outfile}…
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it means install ffmpeg successfully.

these steps followed are to build a test console link with ffmpeg using Qt:
7). create a “Qt Console Application” save at “/Volumes/Mac_OS_4/test/ffmpeg_test”
8). copy the ffmpeg headers and libraries to “/Volumes/Mac_OS_4/test/ffmpeg_test”, in the same directories with “ffmpeg_test.pro”, “main.cpp”:

My code are:

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But when I try to build, it output build issues:
symbol(s) not found
collect2: Id returned 1 exit status

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BTW, when I type “lipo -info libavcodec.a”, the message are:
input file libavcodec.a is not a fat file
Non-fat file: libavcodec.a is architecture: x86_64